J. Cogn. Neurosci.
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(Journal of Cognitive Neuroscience. 2006;18:1174-1180.)
© 2006 The MIT Press

Images of Illusory Motion in Primary Visual Cortex

Axel Larsen1, Kristoffer H. Madsen2,3, Torben E. Lund2 and Claus Bundesen1

1 University of Copenhagen, Denmark, 2 Copenhagen University Hospital, Denmark, 3 Technical University of Denmark, Denmark

Reprint requests should be sent to Axel Larsen, Center for Visual Cognition, Department of Psychology, University of Copenhagen, DK-1361 Copenhagen K, Denmark, or via e-mail: larsen{at}psy.ku.dk.

Illusory motion can be generated by successively flashing a stationary visual stimulus in two spatial locations separated by several degrees of visual angle. In appropriate conditions, the apparent motion is indistinguishable from real motion: The observer experiences a luminous object traversing a continuous path from one stimulus location to the other through intervening positions where no physical stimuli exist. The phenomenon has been extensively investigated for nearly a century but little is known about its neurophysiological foundation. Here we present images of activations in the primary visual cortex in response to real and apparent motion. The images show that during apparent motion, a path connecting the cortical representations of the stimulus locations is filled in by activation. The activation along the path of apparent motion is similar to the activation found when a stimulus is presented in real motion between the two locations.




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